msxml3: Remove unneeded cast

[Andrew Talbot]

Changelog:
    msxml3: Remove unneeded cast.

diff --git a/dlls/msxml3/nodemap.c b/dlls/msxml3/nodemap.c
index 53f2171..1a7d4dc 100644
--- a/dlls/msxml3/nodemap.c
+++ b/dlls/msxml3/nodemap.c
@@ -227,7 +227,7 @@ static HRESULT WINAPI xmlnodemap_setNamedItem(
         nodeNew = xmlAddChild(node, ThisNew->node);
 
         if(namedItem)
-            *namedItem = create_node( (xmlNodePtr) nodeNew );
+            *namedItem = create_node( nodeNew );
 
         IUnknown_Release(pAttr);